feat: add support for themes

[xTudoS]

This change is 

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add back support for themes thanks to https://github.com/vadimdemedes/thememirror

Fix #1549

[xTudoS]

@shakaran @rtritto one of you guys mind in review this PR please?

[rtritto]

@xTudoS the dark theme component should be removed if ME_CONFIG_OPTIONS_EDITORTHEME env var isn't empty.

The theme logic doesn't work, I did some try such as ME_CONFIG_OPTIONS_EDITORTHEME="espresso" or ME_CONFIG_OPTIONS_EDITORTHEME="oneDark".

[xTudoS]

@xTudoS the dark theme component should be removed if ME_CONFIG_OPTIONS_EDITORTHEME env var isn't empty.

The theme logic doesn't work, I did some try such as ME_CONFIG_OPTIONS_EDITORTHEME="espresso" or ME_CONFIG_OPTIONS_EDITORTHEME="oneDark".

thanks for reviewing
I will check

[xTudoS]

@rtritto I decide to keep theme mode toggle because there are dark and light editor themes, just imagine choosing a dark theme for codemirror but the entire application is in light mode.

[xTudoS]

@rtritto would you validate this again please?